258 BACTERIOLOGY. 



Except in the exudations, the organisms are found 

 only in the lumen of the blood vessels, where they are 

 usually present in enormous numbers. 



In the blood they are practically always free and are 

 but rarely found within the bodies of leucocytes. 



In stained preparations from the blood and exudates 

 a capsule is not infrequently seen surrounding the organ- 

 isms. (Fig. 56.) This, however, is not constant. 



FIG. 56. 





Micrococcus lanceolatus in blood of rabbit. Stained by method of Gram. 

 Decolorization not complete. 



If a drop of blood from this animal be introduced 

 into the tissues of a second animal (mouse or rabbit) 

 identically the same conditions will be reproduced. 



If the organism be isolated from the blood of the 

 animal in pure culture, and a portion of this culture be 

 introduced into the tissues of a susceptible animal, again 

 we shall see the same pathological picture. 



It must be remembered, however, that this organism 

 when cultivated for a time on artificial media rapidly 

 loses its pathogenic properties. If, therefore, failure to 

 reproduce the disease after inoculation from old cultures 



